I wouldn't use that shit terrain for reference.
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Anyway, the immediate areas of this terrain that could use work to make it better is the foreground and the mountains.
The purple fog is fine, the clouds looks a bit off, but those are hardly noticeable things compared to the aforementioned.
Sure a natural forest might well look like this, but if you want to make something fancy, then natural isn't necessarily
what you'd want to go for. I'd recommend clearing out some trees and add a lake of some sort, and maybe find some
variations in tree doodads. Variation works wonders.
The mountains are off only because a couple of them are too spiky, and that looks weird. Simply use the smoothing brush
on the tips a little and they'll look fine. Preferably, though, they should look a bit bigger, for scaling sake.
Otherwise, as far as cinematics go, this looks pretty good.
